<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const a = {
        age: 20,
      };
      const b = a;
      console.log(a === b); //true
      b.age = 20;
      console.log(a === b); //true
    </script>
  </body>
</html>
